What Is Outer Space?
In What Is Outer Space?, learn eight facts about outer space. How many planets are there? Are all stars yellow? Learn that and more in this trip through our Solar System.
Lesson Express
Q: What are stars? What is the closest star to Earth?
A: Stars are giant balls of hot gasses. The Sun is the closest star to Earth.
Q: Each moon is unique. How are they different?
A: Some moons are dusty, some are icy, and others have water on them.
Q: Outer space is a vacuum. What does that mean?
A: There is no air, no wind, and no sound.
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